What are some alternatives?
ERPLY Point Of Sale - ERPLY.com is a web based affordable point of sale software and inventory system.
Lightspeed POS - retail and restaurant point-of-sale, ecommerce, and omnichannel solution
Biyo POS - Biyo POS is the free POS (free point-of-sale) small to enterprise software perfect for your retail...
Gazelle Point-of-Sale - Gazelle Point-of-Sale is a cloud web-based POS and inventory software. We have native iPad app, native Android app and offline support. Free POS desktop version available.
PHP Point Of Sale - Point of Sale software
Floreant POS - Floreant POS :: Open Source Point of Sale – Think POS Think Floreant